Automatically detect *.resx file changes on the drive and refresh

**Is your feature request related to a problem? Please describe.**
Whenever I have ResX Resource Manager opened while getting the latest changes in (e.g. with a git pull) I have to be careful to not accidentally undo or remove changes which just came in (with the latest pull).

It **seems** to me as ResX Resource Manager holds the content of the resx files in memory and writes the changes to the corresponding resx files on change/save. It does however not watch the resx files for changes and does therefore not update the state in memory on a file change.

As a workaround I currently
- Close ResX Resource Manager
- pull changes
- Start ResX Resource Manager again.

**Describe the solution you'd like**
An automatic reload / refresh of the entries in ResX Resource Manager on detected resx file changes

**Describe alternatives you've considered**
Alternatively, if the resx file could already be changed in memory, a Visual Studio like dialog (pops up on csproj file changes) could be shown and let the user decide whether to reload changes from disk / keep the ones in memory (or even merge?)