Material Dialogs Versions Save

Version 2 is no longer a release candidate, a stable release is here. Please continue to report any issues, of course.

1. Enable customizing action button color from your theme. See https://github.com/afollestad/material-dialogs/pull/1714.
2. Fix a crash when adding a view as a custom view that already had a parent previously. See https://github.com/afollestad/material-dialogs/issues/1717.

1. Fixed an action button measurement issue.
2. Fixed an odd visual issue with input dialogs.
3. Internal upgrades.

We're nearing 2.0.0 stable.

• Color chooser bug fixes for some screen sizes and certain configurations. See PR #1710.
• Updated coroutines version.

• UI improvements.
• Bug and crash fixes.
• Getters for input field, etc. now throw an exception if the dialog is not setup up correctly rather than returning null.

Fix a color chooser dialog crash if you do not provide any sub-colors.

1. Add selectedFile()/selectedFolder() extension getter methods to MaterialDialog for use with file/folder chooser dialogs.
2. Action buttons now have a 48dp touch target height, still 32dp visibly.
3. Add allowEmpty parameter for input dialogs, which when set to true, allows input dialogs to be submitted with no input.
4. File/folder choosers are smarter about file accessibility, e.g. if your app does not have permission to see files in a folder, that folder will not be considered a parent that you can navigate to.
5. Color chooser dialog cleanup and fixes - which should also hopefully resolve a stack overflow exception.

1. Internal dependency updates.
2. Avoid a crash on some random devices out there, related to loading fonts via AndroidX.
3. Cleanup internal utility methods, reducing method count a bit.

Pretty much ready to go to 2.0.0 stable - pending figuring out why jCenter has issues with hosting Material Dialogs' extension modules.

1. Don't crash if a font resource can't be loaded.
2. Added md_ripple_color theme attribute.

1. The folder creator in file/folder choosers will block reserved characters from being inputed for the folder name. See #1667.
2. Fix various logical issues in the color chooser dialog.
3. The ARGB seek bars in the color chooser should be easier to grab, it's doing some touch event trickery now to better support being inside of a ViewPager.
4. I'm going to start publishing the sample on Google Play again.