split lua files into DCS-gRPC and Hooks

To reduce confusion when developing on DCS-gRPC, I've moved the Lua
files around to map the directory structure once installed as a mod into
DCS more closely.

This means:
- move `lua/lua5.1` to `src/lua5.1` as it is only necessary to build the
  Rust code (which also lives inside of `src/)
- move all other lua files from `lua/*.lua` into `lua/DCS-gRPC`
- except `grpc-hook.lua`, which is moved into `lua/Hooks`

This creates a directory where `DCS-gRPC` and `Hooks` live side-by-side
as they also do once installed as a mod into DCS.

Author: rkusa

.cargo/config.toml

@@ -1,4 +1,4 @@
 [env]
 LUA_LIB_NAME = "lua"
-LUA_LIB = { value = "lua/lua5.1/", relative = true }
-LUA_INC = { value = "lua/lua5.1/include", relative = true }
+LUA_LIB = { value = "src/lua5.1/", relative = true }
+LUA_INC = { value = "src/lua5.1/include", relative = true }

.gitattributes

@@ -1 +1 @@
-lua/lua5.1/** linguist-vendored
+src/lua5.1/** linguist-vendored

README.md

@@ -168,7 +168,7 @@ For development, update the previously added line in `DCS World\Scripts\MissionS
 - dofile(lfs.writedir()..[[Scripts\DCS-gRPC\grpc-mission.lua]])
 + GRPC = {
 + 	dllPath = [[C:\Development\DCS-gRPC\rust-server\target\debug\]],
-+ 	luaPath = [[C:\Development\DCS-gRPC\rust-server\lua\]]
++ 	luaPath = [[C:\Development\DCS-gRPC\rust-server\lua\DCS-gRPC]]
 + }
 + dofile(GRPC.luaPath .. [[grpc-mission.lua]])
 ```