Code refactoring to prepare for future updates

-changed how islands are handled specifically to improve how cylinders are unwrapped. Now only one seam is needed. Goal is to get that to 0
-added preparatory utility code for trim tools
-variety of updates and bug fixes

DUV_ApplyMaterial.py

@@ -0,0 +1,59 @@
+import bpy
+import bmesh
+import math
+from mathutils import Vector
+from . import DUV_Utils
+
+
+class DREAMUV_OT_apply_material(bpy.types.Operator):
+    """Unwrap and attempt to fit to a square shape"""
+    bl_idname = "view3d.dreamuv_apply_material"
+    bl_label = "unwrap to square shape if possible"
+
+    def execute(self, context):
+
+        #check for object or edit mode:
+        objectmode = False
+        if bpy.context.object.mode == 'OBJECT':
+            objectmode = True
+            #switch to edit and select all
+            bpy.ops.object.editmode_toggle() 
+            bpy.ops.mesh.select_all(action='SELECT')
+
+        obj = bpy.context.view_layer.objects.active
+        bm = bmesh.from_edit_mesh(obj.data)
+        uv_layer = bm.loops.layers.uv.verify()
+
+        HSfaces = list()
+        #MAKE FACE LIST
+        for face in bm.faces:
+            if face.select:
+                HSfaces.append(face)    
+
+        #ADD MATERIAL
+        #check if we want to add material, then check if it needs to be added, and keep index for later
+        if context.scene.duv_hotspotmaterial is not None:
+            matindex = 0
+            doesmatexist = False
+            for m in obj.data.materials:
+                if m == context.scene.duv_hotspotmaterial:
+                    doesmatexist = True
+                    break
+                matindex += 1
+            if doesmatexist is False:
+                obj.data.materials.append(context.scene.duv_hotspotmaterial)
+
+
+        #apply material from index
+        if context.scene.duv_hotspotmaterial is not None:
+            for face in HSfaces:   
+                face.material_index = matindex
+
+        bmesh.update_edit_mesh(obj.data)
+        bpy.ops.mesh.select_mode(use_extend=False, use_expand=False, type='FACE')
+
+        if objectmode is True:
+            bpy.ops.mesh.select_all(action='DESELECT')
+            bpy.ops.object.editmode_toggle() 
+
+        return {'FINISHED'}