Fixes for other compilers (#1912)

* remove invalid virtual keywords

* remove duplicate inline

* remove leading 0 in character literals

* add missing public keywords

* fix some struct/class mismatches

include/JSystem/J3DGraphAnimator/J3DAnimation.h

@@ -338,6 +338,7 @@ private:
 };  // Size: 0x28
 
 class J3DAnmTransformFull : public J3DAnmTransform {
+public:
     /* 8032C2AC */ virtual ~J3DAnmTransformFull();
     /* 8032C318 */ virtual s32 getKind() const;
     /* 80328E90 */ virtual void getTransform(u16, J3DTransformInfo*) const;
@@ -347,14 +348,15 @@ private:
 };  // Size: 0x24
 
 class J3DAnmTransformFullWithLerp : public J3DAnmTransformFull {
+public:
     /* 8032C228 */ virtual ~J3DAnmTransformFullWithLerp();
     /* 8032C2A4 */ virtual s32 getKind() const;
     /* 803291F0 */ virtual void getTransform(u16, J3DTransformInfo*) const;
 };  // Size: 0x24
 
 struct J3DTextureSRTInfo;
-struct J3DModelData;
-struct J3DMaterialTable;
+class J3DModelData;
+class J3DMaterialTable;
 
 class J3DAnmTextureSRTKey : public J3DAnmBase {
 public:

include/JSystem/J3DGraphAnimator/J3DCluster.h

@@ -3,7 +3,7 @@
 
 #include "dolphin/types.h"
 
-struct J3DDeformer;
+class J3DDeformer;
 
 struct J3DCluster {
     /* 0x00 */ f32 field_0x0;

include/JSystem/J3DGraphAnimator/J3DJointTree.h

@@ -11,7 +11,7 @@ struct J3DModelHierarchy {
     /* 0x2 */ u16 mValue;
 };
 
-struct J3DMaterialTable;
+class J3DMaterialTable;
 
 struct J3DDrawMtxData {
     /* 803115E0 */ J3DDrawMtxData();

include/JSystem/J3DGraphAnimator/J3DMaterialAttach.h

@@ -3,12 +3,12 @@
 
 #include "dolphin/types.h"
 
-struct J3DMaterial;
-struct J3DTexture;
-struct J3DAnmColor;
-struct J3DAnmTexPattern;
-struct J3DAnmTextureSRTKey;
-struct J3DAnmTevRegKey;
+class J3DMaterial;
+class J3DTexture;
+class J3DAnmColor;
+class J3DAnmTexPattern;
+class J3DAnmTextureSRTKey;
+class J3DAnmTevRegKey;
 class JUTNameTab;
 
 class J3DMaterialTable {