mapjfx 1.12.1 with fixes to the code for caching data

I just released mapjfx version 1.12.1 it should be found shortly at maven central, the artifact coordinates are:

  <dependency>
    <groupId>com.sothawo</groupId>
    <artifactId>mapjfx</artifactId>
    <version>1.12.1</version>
  </dependency>

The source is available at GitHub.

I implemented some improvemtnes to the code that does the caching of map images.

Comments and contributions welcome.