GUACAMOLE-192: Select word in terminal on double click

[corentin-soriano]

Allows selecting a word on double-click and a complete line on triple-click.

Based on the unmaintained PR by @Saiyeux (#406) :

• All "rewritten" functions have been removed in favor of existing functions.
  -> Code simplification.
  -> Fixes several unexpected behaviors when scrolling upwards.
• The following characters are now considered part of a "word": [0-9\/A-Za-z_\~\&\-\.\?\\%=:$]
  -> Allows selecting an IP address, a path or URL (ex: https://www.test.tld/file.php?param1=value1&param2=value%202)
• Improved condition in the guac_terminal_select_update (select.c) function to allow selecting a "word" of a single character on double-click (no impact on single-click).

[jmuehlner]

This looks good to me, aside from a minor punctuation mistake. My only other request would be that some of these commits be reworded and / or squashed.

Each commit should:

• Follow the format GUACAMOLE-1234: Clarify commit message expectations., with the first word capitalized, and a period after the message.
• Cleary explain what the commit is intended to do.

Something like GUACAMOLE-192: revert removed line is unclear about what line is being reverted, and whether it's a substantive change or not. If it's just a minor whitespace fix, I'd suggest just squashing it into whatever commit its related to.

[corentin-soriano]

This looks good to me, aside from a minor punctuation mistake. My only other request would be that some of these commits be reworded and / or squashed.

Each commit should:

• Follow the format GUACAMOLE-1234: Clarify commit message expectations., with the first word capitalized, and a period after the message.
• Cleary explain what the commit is intended to do.

Something like GUACAMOLE-192: revert removed line is unclear about what line is being reverted, and whether it's a substantive change or not. If it's just a minor whitespace fix, I'd suggest just squashing it into whatever commit its related to.

Thank you for your review!

The punctuation mistake is corrected.
It was in fact not really useful to keep all of these commits which were only corrections of the first one. I squashed them.