Vala 0.50.6
===========
 * Various improvements and bug fixes:
  - codegen:
    + Improve handling of ellipsis parameter in get_ccode_name()
    + Fix default value of get_ccode_destroy_notify_pos()
    + Don't override valid target/destroy of previous lambda argument [#59]
    + Don't call *_instance_init() in compact class chainup
  - vala: Mark tranformed static member-access as qualified [#270]
  - girwriter: namespace expects "c:symbol-prefixes" attribute [#1038]
  - girwriter: Don't use instance-parameter inside callback [#1167]
  - girparser,libvaladoc/girimporter: Don't guess length of xml header, iterate
    forward to <repository>
  - libvaladoc/girimporter: parse_constant() use "c:identifier" attribute first

 * Bindings:
  - rest-0.7: Fix OAuthProxyAuthCallback binding
  - gtk+-3.0: Fix ModuleInitFunc binding
  - gio-2.0: Fix TlsPassword.get_value() binding
  - Fix several bindings which lead to invalid code by using them in:
    javascriptcoregtk-4.0, libusb, libusb-1.0, pixman-1,
    webkit2gtk-web-extension-4.0, x11, zlib,