Lua Generator using IR. (#6940)

* initial hack to get new Lua generator into flatc

* Starting to output enum defs for Lua

* Continue to work on table generation for Lua

* Finished basic getter access for Lua

* Added ability to get object by index

* Finished struct builder

* aliased reflection to r

* finish table builder generation

* register requiring files

* better generated header info

* Tying up loose ends

* Updated reflection to handle struct padding

* Addd type sizes to reflection

* Fixed some vector indirect issues

* Lua tests passed

* Misc cleanup

* ci fixes 1

* ci fixes 2

* renaming

* up size of type sizes

* manually ran clang-format-11 -i src/idl_parser.cpp

* fixed some windows casting

* remove stupid auto import

* more static_casting

* remove std

* update other build environments

* remove scoped enums

* replaced std::to_string with NumToString

* more win fixes

* more win fixes

* replaced old lua with new

* removed auto import

* review responses

* more style fixes

* refactor bfbs_gen_len to use code +=

* added consts

* fix lambda capture for windows

* remove unused return type

src/reflection.cpp

@@ -23,7 +23,7 @@
 namespace flatbuffers {
 
 int64_t GetAnyValueI(reflection::BaseType type, const uint8_t *data) {
-// clang-format off
+  // clang-format off
   #define FLATBUFFERS_GET(T) static_cast<int64_t>(ReadScalar<T>(data))
   switch (type) {
     case reflection::UType:
@@ -121,7 +121,7 @@ std::string GetAnyValueS(reflection::BaseType type, const uint8_t *data,
 }
 
 void SetAnyValueI(reflection::BaseType type, uint8_t *data, int64_t val) {
-// clang-format off
+  // clang-format off
   #define FLATBUFFERS_SET(T) WriteScalar(data, static_cast<T>(val))
   switch (type) {
     case reflection::UType: