[Konsole-devel] Support for dim color support, i.e., \e[2m [includes patch]

[Antonio Russo]

The escape code \e[2m should allow for "dimmed" text to be displayed. This is supported in, e.g., xterm and the standard Linux console. The
attached patches implement the infrastructure for color schemes to support dimmed colors [dim-color-support], prevents regressions with the
shipped themes [colorscheme-compat], and provides a full theme for the Linux color scheme [linux-colorscheme].

I.e., this should now work (by which I mean, show as different intensities in the linux color scheme):
echo -e 'A\e[2mA'

The other color schemes are essentially unaffected by this patch---someone with some aesthetic sense ought to check the colors out.

I noticed two other things while adding this feature:

In src/Vt102Emulation.cpp , the support for removing "intense" or "bold" (i.e., \e[21m) was not properly implemented. This patch should also
address this problem. I would appreciate comments verifying my (very limited) understanding of vt102 emulation.

This can be seen by checking:
echo -e 'A\e[1mA\e[21mA'

Additionally, the comments in src/Screen.cpp seem to be misleading or wrong, and the "RE_INTENSIVE" constant appear vestigial from some earlier
implementation of bold/intensive. I started making changes there, but it seems like it might be better off without any comment there, or better
still rewriting it entirely.
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