Adds Start, Stop, Reload lua items
Allows user to stop / start / reload lua from the emulator menu. This will be useful for changing lua files along with the lua file specifier in the other commit.
Sorry for the delay.
The code looks good but I don't like having Lua stuff on the pause menu. Too many buttons already and 99% of users won't be using Lua (or at least won't need to start/stop it). So I'd rather have these buttons in Settings > Advanced > Lua Scripting.
I totally understand the need for a hardcore lua developer to start/stop the runtime easily but it's probably best to use a custom build for this.
Another (minor) thing: I'm not sure the isLuaRunning flag is needed. You could check if the lua_State (L) is null or not.
If it's possible, maybe it should be advanced emulator hotkeys? That prevents the hassle of menus.