cppcheck: Add suppression file for false positives and pending fixes

Documented each suppression issue with comments to distinguish between
false positives and true positives awaiting resolution.

For the false positives suppressions, appropriate information is
provided on why those were considered as false positive.

True positives will be removed from the suppression file once
their corresponding fixes(OSGeo#4702, OSGeo#4638, OSGeo#4500, OSGeo#4499) are merged.

Run:

`cppcheck --suppressions-list=.cppcheck-suppressions <path>`

Signed-off-by: Mohan Yelugoti <[email protected]>

.cppcheck-suppressions

@@ -0,0 +1,173 @@
+# True positives
+# imagery
+invalidFunctionArg:imagery/i.gensigset/subcluster.c:369
+invalidFunctionArg:imagery/i.smap/model.c:158
+
+# lib
+memleakOnRealloc:lib/external/shapelib/dbfopen.c:448
+va_end_missing:lib/gis/debug.c:82
+nullPointer:lib/vector/Vlib/cats.c:513
+nullPointer:lib/vector/Vlib/cats.c:517
+
+# False positives
+# binder
+syntaxError:binder/postBuild:7
+
+# config.guess, config.log, config.status, config.sub, configure, configure.ac
+syntaxError:config*
+
+# db
+syntaxError:db/databaseintro.html
+
+# demolocation
+syntaxError:demolocation/Makefile
+syntaxError:demolocation/grassrc.tmpl
+
+# display
+syntaxError:display/displaydrivers.html
+
+# dist.x86_64-pc-linux-gnu
+syntaxError:dist.x86_64-pc-linux-gnu/*
+
+# doc 
+syntaxError:doc/*
+
+# docker
+syntaxError:docker/README.md
+
+# general/g.version
+internalAstError:general/g.version/main.c:49
+syntaxError:general/g.version/Makefile:8
+syntaxError:general/g.version/g.version.html:72
+
+# imagery/
+syntaxError:imagery/imageryintro.html
+## We are erroring out early if index is negative, so we won't be hitting this case!
+negativeIndex:imagery/i.atcorr/computations.cpp:459
+negativeIndex:imagery/i.atcorr/computations.cpp:1025
+
+
+# include/
+syntaxError:include/Makefile
+syntaxError:include/VERSION:1
+
+# text files 
+syntaxError:INSTALL.md
+syntaxError:install-sh
+syntaxError:GPL.TXT
+syntaxError:aclocal.m4
+syntaxError:AUTHORS
+syntaxError:CITATION.cff
+syntaxError:CITING
+syntaxError:codecov.yaml
+syntaxError:CODE_OF_CONDUCT.md
+syntaxError:config.log
+syntaxError:configure.ac
+syntaxError:CONTRIBUTING.md
+syntaxError:contributors.csv
+syntaxError:contributors_extra.csv
+syntaxError:COPYING
+syntaxError:Dockerfile
+syntaxError:error.log
+syntaxError:flake.lock
+syntaxError:flake.nix
+syntaxError:grasslib.dox
+syntaxError:grass.pc*
+syntaxError:Makefile
+syntaxError:package.nix
+syntaxError:pyproject.toml
+syntaxError:README.md
+syntaxError:renovate.json5
+syntaxError:REQUIREMENTS.md
+syntaxError:SECURITY.md
+syntaxError:test_keyvalue_result.txt
+syntaxError:TODO
+syntaxError:translators.csv
+syntaxError:Vagrantfile
+syntaxError:binaryInstall.src
+syntaxError:codecov.yml:19
+
+# lib/
+syntaxError:lib/README:3
+# Internally generated file while compiling
+nullPointer:lib/db/sqlp/sqlp.yy.c
+nullPointer:<stdout>
+syntaxError:lib/db/sqlp/README
+syntaxError:lib/db/sqlp/sql*
+## va_copy() was used and it doesn't require va_start.
+va_list_usedBeforeStarted:lib/gis/aprintf.c:293
+va_list_usedBeforeStarted:lib/gis/aprintf.c:301
+va_list_usedBeforeStarted:lib/gis/aprintf.c:348
+## Though it's not explicity initialized, the loop next will initialize it. So, it's alright to ignore this.
+uninitvar:lib/vector/dglib/tavl.c:380
+missingReturn:lib/vector/dglib/nodemgmt-template.c:437
+## Though it's not explicity initialized, the loop next will initialize it. So, it's alright to ignore this.
+uninitvar:lib/vector/dglib/avl.c:291
+unknownMacro:lib/bitmap/Makefile:13
+## I feel we can just avoid syntaxError issues, as code can't be compiled unless it's syntax is correct!
+## And these usually have a tendency to pop up in the non-C or non-C++ programs!!
+syntaxError:lib/*
+unknownMacro:lib/gmath/Makefile
+unknownMacro:lib/lidar/Makefile
+
+
+# locale
+syntaxError:locale/README.md
+syntaxError:locale/Makefile
+syntaxError:locale/grass_po_stats.py
+unknownMacro:locale/*
+
+# macosx
+syntaxError:macosx/*
+
+# man
+syntaxError:man/*
+
+# mswindows
+syntaxError:mswindows/*
+
+# raster
+## FP error, as while loop before ensures that log argument is never equal to 1.
+invalidFunctionArg:raster/r.sim/simlib/random.c:36
+invalidFunctionArg:raster/r.sim/simlib/random.c:57
+
+## Different rules under different ifdef. 
+ctuOneDefinitionRuleViolation:raster/r.in.pdal/grassrasterwriter.h:39
+syntaxError:raster/rasterintro.html
+syntaxError:raster/Makefile:155
+
+# raster3d
+
+## 'missingReturn` error is mostly from blocks for local computations
+missingReturn:raster3d/r3.showdspf/draw_cap_ogl.c:68
+missingReturn:raster3d/r3.showdspf/make_header.c:32
+
+syntaxError:raster3d/raster3dintro.html:194
+
+# rpm
+syntaxError:rpm/grass.spec:244
+syntaxError:rpm/grass-pkgconfig.patch:9
+
+# scripts
+syntaxError:scripts/windows_sh_launch.bat:11
+syntaxError:scripts/windows_launch.bat:1
+
+# temporal
+syntaxError:temporal/benchmark.sh:19
+syntaxError:temporal/run_all_tests.sh
+syntaxError:temporal/temporalintro.html
+
+# testsuite
+syntaxError:testsuite/raster_md5test.sh:11
+syntaxError:testsuite/README.md:38
+
+# utils
+syntaxError:utils/*
+unknownMacro:utils/coverage_mapper.py:13
+unknownMacro:utils/Makefile:8
+
+# vector
+
+## We are expected to use the memory allocated some other place, so it's FP.
+memleak:vector/v.lidar.growing/ConvexHull.c:246
+syntaxError:vector/vectorintro.html:11