Move changelog to single file

CHANGELOG.md

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+# Changelog
+
+## v0.25.0
+
+### signal_parser.c and signal_parser.h
+
+[signal_parser.c](https://gitlab.com/projectofst/software10e/-/blob/feat/fcp/v20/fcp/skel/signal_parser.c)
+and
+[signal_parser.h](https://gitlab.com/projectofst/software10e/-/blob/feat/fcp/v20/fcp/skel/signal_parser.h).
+
+The signal parser interface has suffered major changes. The decode functions
+now take the `fcp_signal_t` struct as a parameter instead of individual start,
+length, scale and offset parameters.
+
+```
+typedef struct _signal {
+	uint16_t start;
+	uint16_t length;
+	double scale;
+	double offset;
+	fcp_type_t type;
+	fcp_endianess_t endianess;
+} fcp_signal_t;
+```
+
+The `fcp_signal_t` now includes the signal type and endianess. Check the
+`fcp_type_t` and `fcp_endianess_t` enums for possible values.
+
+Example usage:
+```
+uint64_t value = fcp_decode_signal_uint64_t(msg, 
+	(fcp_signal_t) {
+		.start = start, 
+		.length = length, 
+		.scale = scale, 
+		.offset = offset, 
+		.type= type 
+		.endianess = endianess
+	}
+);
+```
+
+The obvious advantage of this change is the support for big endian signals.
+
+### C codegen
+
+The `fcp c_gen` command was updated to make use of the new signal_parser
+functions.
+
+Those that make use of `c_gen` should not notice any changes **except** for a
+substancial increase in program size.
+
+If this increase in program size is troublesome remember that the compilation
+of devices can be stopped by defining: NO_DCU, NO_MASTER, NO_IIB, ...
+
+### Author note
+
+This release was a bit rushed due to the need to support big endian values in
+Xsense. If you encounter any problems with decoding and encoding fcp signals please
+notify me via discord.
+
+## v0.47.0
+
+### Features
+
+* Show release notes at gui startup
+* Notify of new Fcp versions
+* GUI Undo/Redo 
+
+### Bug Fixes
+* Recent file list is the same for any Fcp instance
+* Fixed unexpected slowness when using save on the GUI
+
+## v0.47.0
+
+### Features
+
+* Add fix command that fixes your json types.
+
+### Bug Fixes
+* Wrong conversion of floating point scaling/offset on decompile
+* Limit number of errors in GUI.
+* Remove dump and print commands that were unused.
+
+## v0.49.0
+
+### Features
+
+ * c-gen --force flag to ignore validate errors
+
+### Bug Fixes
+ * gui wouldn't launch
+
+
+## v0.50.0
+
+### Features
+
+ * fix cmd replaces mux_count 0 with mux_count 1
+
+### Bug Fixes
+
+ * Add fcp appdirs and sqlalchemy dependency
+ * Unify requirements.txt and install_requires
+
+## v0.53.0
+
+### Features
+
+ * implement mux for fcp_lib
+
+## v0.54.0
+
+### Bugs
+
+ * Nag users about new version of FCP
+
+### Features
+
+ * Show FCP release notes
+
+## v0.55.0
+
+### Features
+
+* FcpLib: FcpCom with cmd, set and get
+* Property based testing for signals
+
+
+## v0.55.1
+
+### Bug Fixes
+
+* Gui save not working
+
+### Features
+
+* Gui save doesn't pop a select file menu
+
+## v0.55.2
+
+### Bug Fixes
+
+* Remove type hint
+
+## v0.55.3
+
+### Bug Fixes
+
+* Test against python3.7
+
+## v0.55.4
+
+### Bug Fixes
+
+* Command, Config, Enum add button not working
+* Fixed order of recent files
+
+## v0.55.4
+
+### Bug Fixes
+
+* Regression in message decoding mux support
+
+# v0.55.5
+
+### Bug Fixes
+
+* Regression in message decoding mux support
+
+## v0.55.6
+
+### Bug Fixes
+
+* Regression in message decoding mux support
+
+## v0.55.7
+
+### Features
+
+* New docs signal page
+
+## v0.56.0
+
+ - Check that release notes exist:
+	- add a pre-commit hook (hooks/check_release_notes).
+	- call the script from .gitlab-ci.yaml,
+ - Add better comparison of fcp version to the GUI:
+	- Handle the case of the local version being higher than the upstream one.
+ - Support for encoding socketcan messages.
+ - Improve decoding of signed signals.
+ - Rename fcp_v2 to idl
+
+This release contains some bugfixes, small improvements and introduces
+fcp_v2 the new description language that replaces the fcp json
+specification format.
+
+For now fcp commands support both the json specification format and
+fcp_v2.
+
+Expect more information regarding fcp_v2 in future releases.
+
+## v0.56.1
+
+### Bug Fixes
+
+* Non multiplexed signals belonging to messages with other signals that are multiplexed are no longer interpreted as multiplexed signals in the decoding process.
+
+## v1.0.0
+
+ * Remove fcp gui
+ * Implement new fcp IDL
+ * Implement converter for old fcp json configuration to new IDL.
+ * Implement generator for old json configuration