Fix most compiler warnings in the boot and code segments (#674)

* Less warnings in boot & code segments

* few more warnings gone

* Ran formatter

* z_view warning gone

* -> 1

* f31 -> 31

* Remove function casts

* Few more small improvements

* Separate declaration and assignment in func_80091738 and Item_Give

Co-authored-by: Thar0 <maximilianc64@gmail.com>

src/libultra_code_O2/guPosition.c

@@ -3,8 +3,7 @@
 /**
  * guPositionF
  * Creates a rotation/parallel translation modeling matrix (floating point)
- **/
-
+ */
 void guPositionF(f32 mf[4][4], f32 rot, f32 pitch, f32 yaw, f32 scale, f32 x, f32 y, f32 z) {
     static f32 D_80134D00 = M_PI / 180.0;
     f32 sinr, sinp, sinh;
@@ -51,5 +50,5 @@ void guPosition(Mtx* m, f32 rot, f32 pitch, f32 yaw, f32 scale, f32 x, f32 y, f3
 
     guPositionF(mf, rot, pitch, yaw, scale, x, y, z);
 
-    guMtxF2L(mf, m);
+    guMtxF2L((MtxF*)mf, m);
 }