Adds working filename detection method

Adds get current branch method
Fixes diff with working tree when file was renamed
Fixes various quick pick commands when file was renamed
Adds branch support to ShowQuickRepoHistory
Adds branch info to repo quick pick placeholder
Adds Show Branch History to commit limited branch history quick pick
Adds Show File History to commit limited file history quick pick
Removes conditional display of commit details on commit file details quick pick
Removes conditional display of show file history on commit file details quick pick
Fixed #30 - Diff with Working Tree fails from repo/commit quickpick list if file was renamed (and the commit was before the rename)

src/quickPicks/commitDetails.ts

@@ -130,7 +130,7 @@ export class CommitDetailsQuickPick {
         const pick = await window.showQuickPick(items, {
             matchOnDescription: true,
             matchOnDetail: true,
-            placeHolder: `${commit.shortSha} \u2022 ${commit.author}, ${moment(commit.date).fromNow()} \u2022 ${commit.message}`,
+            placeHolder: `${commit.shortSha} \u00a0\u2022\u00a0 ${commit.author}, ${moment(commit.date).fromNow()} \u00a0\u2022\u00a0 ${commit.message}`,
             ignoreFocusOut: getQuickPickIgnoreFocusOut(),
             onDidSelectItem: (item: QuickPickItem) => {
                 scope.setKeyCommand('right', item);