Updated NaSC to 0.6.1 which includes an updated build system and new calculation features.

Changelog:

• Added convert to different number bases. E.g. 16734003 to hex
• Build libqalculate as submodule - This means better calculation results and more functions
• Available number bases: hex bin dec oct duo roman bijective roman sexa fp32 fp64 fp16 fp80 fp128
• Improved scroll behavior when using long equations or results.
• Ctrl + Shift + C copys result when nothing is marked in the input pane.
• Right click on a result copies it to the clipboard.
• Auto complete functions with parenthesis.
• Quit on Ctrl + Q.
• Fix of a parsing error in the help pane.

Tested 0.6.1 by running through tutorial and doing a set of example calculations. Everything looked and functioned as expected.