FidoCadJ version 0.24.8 zeta

NOTE: requires Java 9 or more recent, compiled with JDK 14.
GOALS: test new functions for version 0.24.8. Implement subscripts and superscripts.
KNOWN ISSUES: Text with subscripts and superscripts is not rendered correctly in vector file exports.

• Implement subscripts and superscripts (issue #71).
• Fix incorrect export of dashed lines (issue #142).
• Export splitting layers on multiple files (issue #154).
• Fix Inverted filter symbols (issue #153).
• Enter image size when exporting in bitmap format (issue #147).
• The arrow length and half widths may be floating point (issue #111).
• Increase precision of arrows (issue #172).
• Avoid that certain characters in text break the SVG export (issue #162).
• Fix certain components (issue #173).
• Fix a performance issue with Linux and certain zoom factors (issue #166).
• Add norator and nullator symbols for the EY library (issue #167).
• More precise handling of dashed curves (issue #161).
• Correct handling of accented characters for Java >7 (issue #149).
• Fix incompatibility with Java versions >=9 (issue #150).
• Implement "Copy as image" feature (issue #146).
• Makes sort that the zoom box does not receive focus too often (issue #180).
• Get back to editing mode (arrow) with [ESC] (issue #182).
• Right click when inserting macros switches to edit state (issue #144).