Adds blame "references" (wip)

src/constants.ts

@@ -0,0 +1,15 @@
+export type Commands = 'git.action.showBlameHistory';
+export const Commands = {
+    ShowBlameHistory: 'git.action.showBlameHistory' as Commands
+}
+
+export type DocumentSchemes = 'gitblame';
+export const DocumentSchemes = {
+    GitBlame: 'gitblame' as DocumentSchemes
+}
+
+export type VsCodeCommands = 'vscode.executeDocumentSymbolProvider' | 'editor.action.showReferences';
+export const VsCodeCommands = {
+    ExecuteDocumentSymbolProvider: 'vscode.executeDocumentSymbolProvider' as VsCodeCommands,
+    ShowReferences: 'editor.action.showReferences' as VsCodeCommands
+}