More graphics and control key detection

More graphics stuff including import and down-conversion of full-colour images, plus control key detection in gets().

Commands updated:

• slice has been renamed to slice_ to avoid stomping on Python keyword
• area now has a scale optional parameter
• gets now detects control key presses

Commands added:

• set_points_style(points_style, points_list)
• ask_points_style()
• points(coord_list, brush=None, size=None, style=None)
• fetch(block_number, filename)
• writeblock(block_number, coord)

Bug fixes:

• y-axis still had a bug but now fixed
• some input validation on optional parameters would break for default values

Removed dependency on OpenCV

Removed dependency on OpenCV, fixed bugs, crisper rendering and added 8 new commands.

Commands added:

• circle(radius, coord_list, brush=None)
• slice(radius, from_angle, to_angle, coord_list, brush=None)
• set_plot_font(plot_font)
• ask_plot_font()
• ask_paper()
• ask_pen()
• ask_brush()
• ask_charset()

Bug fixes:

• No longer draws everything one pixel higher
• More precise and faster rendering
• Cursor now matches pen colour
• Fixed wonky font images
• Fixed RM Nimbus logo image
• Fixed intermittent floppy drive
• Shutdown by CTRL-C interrupt doesn't get delayed

Revised package structure

Revised package structure to solve module import errors with Sphinx.

Nimbus and Command classes are now imported like this:

from nimbusinator.nimbus import Nimbus
from nimbusinator.command import Command

First public release

First public release!

Key features:

• High-resolution (640x250) 4 colour mode
• Low-resolution (320x250) 16 colour mode
• Welcome Screen and DOS boot sequence
• Full screen mode
• Nimbus sleep method
• Keyboard input with cursor
• Nimbus colours
• Both Nimbus charsets

Commands added:

• area(coord_list, brush=None)
• ask_charset()
• ask_curpos()
• cursor_position (tuple)
• cls()
• flush()
• gets()
• input(prompt)
• line(coord_list, brush=None)
• plonk_logo(coord)
• plot(text, coord, size=1, brush=None, direction=0, font=None)
• print(text)
• put(ascii_data)
• set_border(colour)
• set_brush(colour)
• set_charset(charset)
• set_colour(colour1, colour2)
• set_curpos(cursor_position)
• set_cursor(flag)
• set_mode(columns)
• set_paper(colour)
• set_pen(colour)