Enable more font sizes

[Slapparoo]

Enable the ability to change font size from 8x8 to other fixed width font sizes.

• Also included is a 8x12 font which can be enabled by editing Kernel/KernelA.HH and recompiling the kernel by commenting the blocks:

#define FONT_WIDTH           8
#define FONT_HEIGHT          8
#define SYS_FONT_STD	sys_font_std
#define SYS_FONT_AUX	sys_font_aux

And Uncommenting

#define FONT_WIDTH		8
#define FONT_HEIGHT 	        12
#define SYS_FONT_STD	sys_font_lat0_8x12
#define SYS_FONT_AUX	sys_font_block_8x12

• Also includes a 8x12 font edit demo src/Demo/Graphics/FontEd_8x12.ZC
• Also includes a new 'Flag' to enable/disable underline
  Set DISPLAY_UNDERLINE to 0 to disable underline, and 1 to enable underline.

[TomAwezome]

As I explained in the prior larger PR:

"...the Charter currently upholds 8x8 font limitation and Zeal follows Zeal's Charter, you will need to include in this PR your proposal for what to change the Charter to force the OS to follow."