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/code/sys_ucode.c

@@ -3,18 +3,18 @@
 u32 D_8012DBA0 = (u32)&D_80155F50;
 u32 D_8012DBA4 = (u32)&D_80157580;
 
-u32 SysUcode_GetUCodeBoot() {
+u32 SysUcode_GetUCodeBoot(void) {
     return &D_80009320;
 }
 
-u32 SysUcode_GetUCodeBootSize() {
+u32 SysUcode_GetUCodeBootSize(void) {
     return (u32)&D_800093F0 - (u32)&D_80009320;
 }
 
-u32 SysUcode_GetUCode() {
+u32 SysUcode_GetUCode(void) {
     return D_8012DBA0;
 }
 
-u32 SysUcode_GetUCodeData() {
+u32 SysUcode_GetUCodeData(void) {
     return D_8012DBA4;
 }