Decompile most effect files in "code" (#144)

- `z_effect`: Matched and essentially all documented.
- `z_eff_spark.c`: Decompiled (1 non matching left) and mostly documented.
- `z_eff_shield_particle.c`: Matched and mostly documented.
- `z_eff_blure.c`: Decompiled (5 non matchings left) and partially documented.
- `z_effect_soft_sprite.c`: Matched and mostly documented.
- `z_eff_ss_dead.c`: Matched but not documented.
- `z_effect_soft_sprite_dlftbls.c`: "Matched" (only data, contains the effect ss overlay table).
- `z_effect_soft_sprite_old_init.c`: Not decompiled, but functions are categorized by effect ss overlay. And they should be decompiled at the same time as their corresponding effect ss in the future.

Other changes:
- Added a lot of types/enums to `z64effect.h`and moved+renamed some structs from `z64.h` to this header
- Added effect ss overlay segments to `segment_symbols.h` and effect ss init vars to `initvars.h`
- Added a macro called `VTX_T` to generate a `Vtx_t` in the same style as `VTX`
- Fixed `flg_set.c` .bss to be in the right file
- Removed `tools/overlayhelpers/batchdisasm` since it's no longer relevant
- Removed unused leftover asm from recent PRs

include/macros.h

@@ -67,7 +67,9 @@
  * `cbnz` blue component of color vertex, or z component of normal vertex
  * `a` alpha
 */
-#define VTX(x,y,z,s,t,crnx,cgny,cbnz,a) { { { x, y, z }, 0, { s, t }, { crnx, cgny, cbnz, a }, }, }
+#define VTX(x,y,z,s,t,crnx,cgny,cbnz,a) { { { x, y, z }, 0, { s, t }, { crnx, cgny, cbnz, a } } }
+
+#define VTX_T(x,y,z,s,t,cr,cg,cb,a) { { x, y, z }, 0, { s, t }, { cr, cg, cb, a } }
 
 #define VIEWPORT_INIT(viewport, by, rx, ty, lx) \
      viewport.bottomY = by; \