feat(gui): add toolbar widget

feat(gui): add grid_select, toggle, panel, status_bar, image widgets
fix(bsp): fill in exterior cells

.clang-format

@@ -0,0 +1,41 @@
+BasedOnStyle: LLVM
+
+Language: C
+Standard: Latest
+
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+ColumnLimit: 120
+
+PointerAlignment: Left
+ReferenceAlignment: Left
+SpaceBeforeParens: ControlStatements
+
+BreakBeforeBraces: Attach
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLoopsOnASingleLine: false
+AllowShortBlocksOnASingleLine: Empty
+
+BinPackArguments: true
+BinPackParameters: true
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: Consecutive
+AlignEscapedNewlines: Left
+AlignOperands: Align
+
+IncludeBlocks: Preserve
+SortIncludes: Never
+
+SpaceAfterCStyleCast: false
+SpacesInParens: Never
+
+IndentCaseLabels: false
+IndentPPDirectives: None
+
+MaxEmptyLinesToKeep: 1
+KeepEmptyLines:
+  AtEndOfFile: false
+  AtStartOfBlock: false
+  AtStartOfFile: false