Added Help sections on iOS, small improvements and bug fixes

both versions:
- added 'Taper' brush - similar to default brush in old Artstudio
- fixed wrong 1st frame in Screen Recording
- fixed Crop Layer To Image Bounds in some cases
- fixed Pick and Move mode in Move tool
- moving a selection is now possible only in 'New' mode (not possible in 'Add', 'Subtract' , 'Intersect')
- fixed Crop and Ellipse/Rect select tool when trying to select area out of image bounds
- changed order of buttons in export view - now PNG is the first from left
- few other small fixes and improvements

iOS version
- added 'Get Started' and 'FAQ' sections - available in Artstudio submenu list
- added separate option in Artstudio->Preferences for Eyedropper Delay when using Pencil
- fixed Polygon Lasso in Pencil Only mode - now if line was started using Pencil it can be continuead only with Pencil
- now 'Open Documents' popover is automatically hidden after closing all documents

macOS version:
- now Rename Group popup is correctly dismissed

Here I'm starting to publish all brushes from the old Artstudio app.
The first pack is Splats

It fixes few stability issues.

First bug fixing update is available on both App Stores.

What's new
both versions:
- updated link in Artstudio->Review On The App Store
- few small bug fixes

macOS version:
- fixed crash when using Option-Mouse wheel to zoom canvas
- default window size is a bit bigger

Hi, I'm Sylwester Los, owner of Lucky Clan company. I'm one of the developers of Artstudio Pro and many other Lucky Clan apps.
I live in Poland, so please forgive me my poor English.

Please feel free to introduce yourself!