Clean up angle constants and conversions (#1135)

* Add angle conversion constants and macros

* Replace angle literals with hex instead of decimal

src/d/d_cam_param.cpp

@@ -147,7 +147,7 @@ dCamBGChk_c::dCamBGChk_c() {
 }
 
 static f32 dummy() {
-    return 182.04445f;
+    return DEG2S_CONSTANT;
 }
 
 /* 800AF8F4-800AF930       .text __ct__11dCamParam_cFl */