Lua changes

This branch makes the following changes to Lua:

• ALL7EMERALDS has been changed to the Boolean type (returns false or true instead of 0 or 1, as it is intended to!)
• EvalMath has been removed (use _G[] to convert strings to their proper enumerated value and do the math yourself)
• lua_Number has been changed from ptrdiff_t to an explicit INT32
• angle_t now goes through a bit shift conversion when passed to Lua or retrieved, making angles in Lua no longer wrap around to the negative values and instead range from 0 to FRACUNIT.
• Adds sidedef texture (by number) and offset manipulation to Lua.
• Fixes a potential tmthing sanity check crash when manipulating sector heights outside of P_MapStart and P_MapEnd
• Completely rewrote lua_hooklib.c to marginalize its use of the Lua stack.

Most of these changes are made in their own independent commits and can be cherry-picked as needed.

Changing Lua's use of angle_t in this manner is consistent with how ZDoom's ACS handles the same problem, and enables modders access to just using FixedDiv/FixedMul functions on FRACUNIT to come up with their own intermediate angles.

To facilitate this, all cases where Lua passes a number from C or retrieves a number to C where that number is expected to be a fixed_t or an angle_t have been given their own unique macro defines, namely luaL_checkfixed, luaL_checkangle, lua_pushfixed, and lua_pushangle. This keeps the code clean of bit-shifting conversions when moving angle_t between Lua and C, and allows future revisions to potentially add similar special handling for fixed_t values (although right now fixed_t == INT32 so it is a nonissue)

src/blua/luaconf.h

@@ -11,6 +11,13 @@
#include <limits.h>
#include <stddef.h>
+#ifdef _MSC_VER
+#define INT32 __int32
+#else
+#include <stdint.h>
+#define INT32 int32_t
+#endif
+
/*
** ==================================================================
@@ -140,7 +147,7 @@
** CHANGE that if ptrdiff_t is not adequate on your machine. (On most
** machines, ptrdiff_t gives a good choice between int or long.)
*/
-#define LUA_INTEGER	ptrdiff_t
+#define LUA_INTEGER	INT32
/*
@@ -502,13 +509,13 @@
*/
//#define LUA_NUMBER_DOUBLE
-#define LUA_NUMBER	ptrdiff_t
+#define LUA_NUMBER	INT32
/*
@@ LUAI_UACNUMBER is the result of an 'usual argument conversion'
@* over a number.
*/
-#define LUAI_UACNUMBER	ptrdiff_t
+#define LUAI_UACNUMBER	INT32
/*
@@ -519,14 +526,14 @@
@@ lua_str2number converts a string to a number.
*/
#ifdef LUA_WIN
-	#define LUA_NUMBER_SCAN		"%Ii"
-	#define LUA_NUMBER_FMT		"%Ii"
+	#define LUA_NUMBER_SCAN		"%d"
+	#define LUA_NUMBER_FMT		"%d"
#else
-	#define LUA_NUMBER_SCAN		"%ti"
-	#define LUA_NUMBER_FMT		"%ti"
+	#define LUA_NUMBER_SCAN		"%d"
+	#define LUA_NUMBER_FMT		"%d"
#endif
#define lua_number2str(s,n)	sprintf((s), LUA_NUMBER_FMT, (n))
-#define LUAI_MAXNUMBER2STR	32 /* 16 digits, sign, point, and \0 */
+#define LUAI_MAXNUMBER2STR	12 /* 10 digits, sign, and \0 */
#define lua_str2number(s,p)	strtol((s), (p), 10)