Allow mouse selection override using ShiftMask

Similar to xterm or urxvt holding shift before selecting text with the mouse
allows to override copying text. For example in tmux with "mode-mouse on" or
vim (compiled with --with-x), mc, htop, etc.

forceselmod in config.h sets the modifier to use this mode, by default
ShiftMask.

Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
Fix colour-model and simplify xloadcols()

Signed-off-by: Christoph Lohmann <20h@r-36.net>
Fixing trailing whitespaces.
Brightening is again on the TODO list.
Add FRIGN to License, remove trailing whitespace

Signed-off-by: Christoph Lohmann <20h@r-36.net>
Fix some more LICENSE changes.
Fixed copying empty lines inside selection.

The code was assuming that empty lines have implicit wrap-around attribute.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
Fixing italic bold.

Thanks Felipe Spychalski <spychalski@gmail.com> for the patch!
Don't report release events for mouse wheel

Signed-off-by: Christoph Lohmann <20h@r-36.net>
Refactor xsetcolorname()

I mainly improved the slightly off algorithm used to load colours in the 256-colour-space and
removed unnecessary local values (r,g,b,colour).
"colour" is not necessary as a punchbag for XftColorAlloc[Value,Name], as they don't mess with
the result-adress until they are absolutely sure everything worked out[0].

Being at it, I changed the error-returns for AllocValue to dies (just like in xloadcols()), as
a failure is most likely an OOM-situation you better catch early.
In case of an invalid name everything stays the same.

[0]: http://www.opensource.apple.com/source/X11libs/X11libs-40/libXft/libXft-2.1.13/src/xftcolor.c

Signed-off-by: Christoph Lohmann <20h@r-36.net>
Revert "Refactor xsetcolorname()"

This reverts commit a32c5f5726f514b49bd396f27aab0e78c40126d3.
Fixing color and refactor xsetcolorname.

By  the recommendation of FRIGN I refactored xsetcolorname to remove the
unnecessary r, g, b variables when allocating a new  color.  Colors  are
now freed and set to the new color. A die() should not happen here. Oth‐
erwise it is easy for applications to kill st. St should be resilent  to
malicious input.

Second  this  patch  standardises  the  naming  of  »color«. There is no
»colour« here. Maybe in some parts of the world.
Make selection consistent over line breaks.

Currently, selection is expanded to the end of the line over line breaks only in
regular selection mode, when the line in not empty and when going down and/or
right. This covers all the cases including word selection mode, with the
exception of rectangular selection because it would make this mode too rigid.
This adjustment is made in selsort so I renamed it to selnormalize to better
reflect what it does now.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
tiny cleanup

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
Fix rectangular selection.

selsort computes the wrong normalized coordinates when rectangular
selection is enabled, causing rectangular selection to only work
when going toward either the top left corner, or the bottom right
one.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
Refactor selsnap SNAP_WORD.

Refactor the SNAP_WORD part in selsnap, and fix a bug that caused the word
delimiters to be ignored if it was at the very beginning or end of a wrapped
line.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
Remove unnecessary typedef

This should also fix compiling-errors on OpenBSD,
as reported by Nils R. Thanks!

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
Simplify tdeftrans
Style police.
FAQ: update typo and escape code for smkx

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>