Split glitchrunner mode into multiple versions

Previously, turning glitchrunner mode on essentially locked you to
emulating 2.0, and turning it off just meant normal 2.3 behavior. But
what if you wanted 2.2 behavior instead? Well, that's what I had to ask
when a TAS of mine would desync in 2.3 because of the two-frame delay
fix (glitchrunner off), but would also desync because of 2.0 warp lines
(glitchrunner on).

What I've done is made it so there are three states to glitchrunner mode
now: 2.0 (previously just the "on" state), 2.2 (previously a state you
couldn't use), and "off". Furthermore, I made it an enum, so in case
future versions of the game patch out more glitches, we can add them to
the enum (and the only other thing we have to update is a lookup table
in GlitchrunnerMode.c). Also, 2.2 glitches exist in 2.0, so you'll want
to use GlitchrunnerMode_less_than_or_equal() to check glitchrunner
version.

desktop_version/src/GlitchrunnerMode.c

@@ -0,0 +1,69 @@
+#include "GlitchrunnerMode.h"
+
+#include <SDL_assert.h>
+#include <SDL_stdinc.h>
+
+#define LOOKUP_TABLE \
+    FOREACH_ENUM(GlitchrunnerNone, "") \
+    FOREACH_ENUM(Glitchrunner2_0, "2.0") \
+    FOREACH_ENUM(Glitchrunner2_2, "2.2") \
+
+const char* GlitchrunnerMode_enum_to_string(const enum GlitchrunnerMode mode)
+{
+    switch (mode)
+    {
+#define FOREACH_ENUM(MODE, STRING) \
+    case MODE: \
+        return STRING;
+
+    LOOKUP_TABLE
+
+#undef FOREACH_ENUM
+
+    /* Compiler raises warning about this enum not being handled. */
+    case GlitchrunnerNumVersions:
+        break;
+    }
+
+    SDL_assert(0 && "Passed non-existent GlitchrunnerMode!");
+    return GlitchrunnerMode_enum_to_string(GlitchrunnerNone);
+}
+
+enum GlitchrunnerMode GlitchrunnerMode_string_to_enum(const char* string)
+{
+#define FOREACH_ENUM(MODE, STRING) \
+    if (SDL_strcmp(STRING, string) == 0) \
+    { \
+        return MODE; \
+    }
+
+    LOOKUP_TABLE
+
+#undef FOREACH_ENUM
+
+    return GlitchrunnerNone;
+}
+
+#undef LOOKUP_TABLE
+
+static enum GlitchrunnerMode current_mode = GlitchrunnerNone;
+
+void GlitchrunnerMode_set(const enum GlitchrunnerMode mode)
+{
+    current_mode = mode;
+}
+
+enum GlitchrunnerMode GlitchrunnerMode_get(void)
+{
+    return current_mode;
+}
+
+int GlitchrunnerMode_less_than_or_equal(const enum GlitchrunnerMode mode)
+{
+    if (current_mode == GlitchrunnerNone)
+    {
+        return current_mode == mode;
+    }
+
+    return current_mode <= mode;
+}