Added new syntaxes and some bugfixes

Hello 😄
Today's update add a lot of new syntaxes to make your image as you want 😉
Here's list of adde / fixed features:

+ Added expression to get image from locale file
+ Added effect to draw line
+ Added effect to draw rounded rectangle with custom arcs
+ Added DrawString effect to make the text center
+ Added image rounded expression

~ Fixed version configuration in the build.gradle

Don't forget to star the github, or ask me new features in issue section ^^
Have a nice evening !