weechat: 2.6 -> 2.7

Disables support for Javascript and PHP:
- Javascript requires an old version of v8
- PHP requires a larger number of dependencies in addition to php-embed

Changelog [1]:

  New features
    - core: add option weechat.look.nick_color_hash_salt to shuffle nick colors (issue #635)
    - core: add different icons sizes (16x16 to 512x512) (issue #1347)
    - core: add file weechat.desktop
    - core: add reverse of string for screen in evaluation of expressions with "revscr:"
    - core: add length of string (number of chars and on screen) in evaluation of expressions with "length:xxx" and "lengthscr:xxx"
    - core: add calculation of expression in evaluation of expressions with "calc:xxx" (issue #997)
    - core: add optional default path (evaluated) in completion "filename"
    - core: add support of modifiers in evaluation of expressions with "modifier:name,data,string"
    - api: add modifier "color_encode_ansi" (issue #528)
    - api: add modifier "eval_path_home"
    - irc: add filters on raw buffer (issue #1000)
    - irc: add option irc.look.display_pv_warning_address to display a warning in private buffer if the remote nick address has changed (issue #892)
    - irc: add server option "ssl_password" (issue #115, issue #1416)
    - irc: add "user" in output of irc_message_parse (issue #136)
    - irc: add options irc.color.message_kick and irc.color.reason_kick (issue #683, issue #684)
    - logger: add option logger.file.color_lines (issue #528, issue #621)
    - script: add options "-ol" and "-il" in command "/script list" to send translated string with list of scripts loaded, display "No scripts loaded" if no scripts are loaded
    - xfer: add option xfer.file.download_temporary_suffix with default value ".part" (issue #1237)

  Bug fixes
    - core: set buffer name, short name and title only if the value has changed
    - core: fix scrolling up in bare mode when switched to bare mode at the top of the buffer (issue #899, issue #978)
    - core: optimize load of configuration files
    - core: fix window separators not respecting window splits (issue #630)
    - core: fix cursor mode info when prefix_align is none and with words split across lines (issue #610, issue #617, issue #619)
    - core: add support of reverse video in ANSI color codes
    - core: fixed segfault during excessive evaluation in function string_repeat (issue #1400)
    - buflist: fix extra spaces between buffers when conditions are used to hide buffers (regression introduced in version 2.6) (issue #1403)
    - irc: do not automatically open a channel with name "0" (issue #1429)
    - irc: remove option irc.network.channel_encode, add server option "charset_message" to control which part of the IRC message is decoded/encoded to the target charset (issue #832)
    - irc: use path from option xfer.file.upload_path to complete filename in command "/dcc send" (issue #60)
    - logger: fix write in log file if it has been deleted or renamed (issue #123)
    - python: send "bytes" instead of "str" to callbacks in Python 3 when the string is not UTF-8 valid (issue #1389)
    - relay: send message "_buffer_title_changed" to clients only when the title is changed
    - xfer: fix memory leak when a xfer is freed and when the plugin is unloaded

  Tests
    - unit: add tests on GUI color functions

  Build
    - core: fix build on Haiku (issue #1420)
    - core: fix build on Alpine
    - core: remove file FindTCL.cmake
    - core: display an error on missing dependency in CMake (issue #916, issue #956)
    - debian: disable Javascript plugin on Debian Sid and Ubuntu Eoan
    - debian: build with Guile 2.2
    - guile: add support of Guile 2.2, disable /guile eval (issue #1098)
    - python: add detection of Python 3.8

[1] https://weechat.org/files/changelog/ChangeLog-2.7.html