Unity 6.3 support + rewrite Color picker + various fix

[FFHstudioHugo]

feat: Unity 6.3 compatibility, safe reflection, 1D palette, reliable repaint

Replace ambiguous reflection with exact lookups

• Methods: GetMethod("...", types: Type.EmptyTypes)

• Properties: GetPropertyExact(type, name, returnType) to avoid AmbiguousMatchException

• Resolve members from instances (sceneHierarchy, treeView, data) in RefreshFolderIcons()

• Stop eager binding of fragile PropertyInfo/MethodInfo; use name + arity at runtime

• Add hard guards in IMGUI path to prevent NRE and GUI clip errors

• try/catch around reflection, early returns

Switch to 1D color palette

• HierarchyFolderIcon.IconColors : Color[]

• pre-tinted variants _openVariants/_closedVariants

• GetIcons(storedIndex, out openTex, out closedTex) maps 0=default, 1..N=colors[i-1]

Update InitIfNeeded()

• cache only GetAllSceneHierarchyWindows() and sceneHierarchy property

• support moved types (UnityEditor.SceneHierarchy or UnityEditor.IMGUI.Controls.SceneHierarchy)

• Add ForceRepaint() and ResetFolderIcons()

• load default folder icons

• rebuild tinted variants on demand

• force hierarchy repaint after changes

Fix FolderEditor

• use actual serialized field "_colorIndex"

• UI is 0-based, storage is 1-based (_colorIndex = popup + 1)

• clamp index and show color preview

• Align Folder.TryGetIconIndex()

• return false if _colorIndex == 0, else index = 1..N expected by GetIcons()

• clamp against HierarchyFolderIcon.IconColors.Length

Cleanup

• remove old 2D palette logic, tuples, and obsolete caches

• remove eager binds for treeView/data/selectedIcon/objectPPTR

• add helpers GetPropertyByName and GetPropertyExact

• Result: no lag or AmbiguousMatchException on Unity 6.3, colored folder icons apply correctly, inspector changes update the hierarchy immediately.