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/z_prenmi_buff.c

@@ -5,6 +5,7 @@
 
 void PreNmiBuff_Init(PreNmiBuff* this) {
     this->resetting = false;
+
     if (osResetType == COLD_RESET) {
         this->resetCount = 0;
         this->duration = 0;