* add hotkey `Ctrl+Down/⌘+Down` to fetch directly
* keep translation keys of en_US in order
* add translations for zh_CN and zh_TW
* do NOT using namespace under `SourceGit`
* use `⇧` instead of `Shift` in hotkey tips
* hotkey mismatch on macOS
* hotkeys to start fetch/pull/push directly not work on macOS
* remove the hotkey of `Create Branch` context menu item
- there are other objects (such as branch and tag) also have the `Create Branch` context menu item without hotkeys
- on macOS, we already use `⌘+B` to create branch with selected commit, not `Ctrl + B`
Signed-off-by: leo <longshuang@msn.cn>
* use system chrome instead of custom caption button on macOS
* move `BeginMoveWindow` and `MaximizeOrRestoreWindow` to `ChromelessWindow`
* better supports for fullscreen mode on macOS
* redesign the layout of title bar for all windows
Signed-off-by: leo <longshuang@msn.cn>
* move resources and styles for macOS caption button to `CaptionButtonsMacOS` because it is never used by others and should not been changed
* add `IsCloseButtonOnly` property to `CaptionButtons` and `CaptionButtonsMacOS` and replace the controls in windows
* add `Shift+Ctrl+Tab` (`⌘+⌥+←` on macOS) to go to previous page
* use `ESC` to cancel commit searching
* enable `AutoFocusBehaviour` on `CommitChanges` and `RevisionFiles` tab
* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.
