Allow implicit float to int conversions in sol2

tolua was implicitly converting floats to ints, but sol2 chokes on this. For
backward compatibility and to fix our own rulesets, disable this check in sol.

Closes #1161.

dependencies/sol2/CMakeLists.txt

@@ -1,3 +1,6 @@
 add_library(sol2 INTERFACE)
-target_compile_definitions(sol2 INTERFACE SOL_ALL_SAFETIES_ON=1)
+target_compile_definitions(sol2 INTERFACE
+                           SOL_ALL_SAFETIES_ON=1
+                           # Allow float -> int conversions
+                           SOL_NO_CHECK_NUMBER_PRECISION=1)
 target_include_directories(sol2 INTERFACE "${CMAKE_CURRENT_LIST_DIR}")