[gnome-builder] (15 commits) Non-fast-forward update to branch wip/mwleeds/ide-config-provider

[Matthew Leeds <mwleeds src gnome org>]

The branch 'wip/mwleeds/ide-config-provider' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  679f518... config-provider: Add IdeConfigurationProvider
  1af3416... config-manager: Use IdeConfigurationProvider interface
  be56949... flatpak: Move flatpak manifests from runtimes to configurat
  d7b78a4... Update .buildconfig to use the right flatpak runtime
  906badb... configuration: Make IdeConfiguration derivable
  43e08db... flatpak: Create GbpFlatpakConfiguration
  a88adc2... flatpak: Make the flatpak manifest search recursive
  dfc9acb... buildui: Move build-tools plugin to libide
  cc3b9ea... buildsystem: Create IdeBuildconfigConfigurationProvider
  c8be3a7... flatpak: writeback manifest changes to disk
  ff3a644... configuration: Mark config as dirty when IdeEnvironment cha

Commits added to the branch:

  20bb05e... flatpak: Check FlatpakInstallation pointer for NULL (*)
  fd0b660... plugins: Fix the PeasEngine search path (*)
  842196f... flatpak: Fix memory leaks and a possible use-after-free (*)
  e1db3fa... flatpak: Allow project file to be a directory (*)
  22bb500... config-provider: Add IdeConfigurationProvider
  e5223a9... config-manager: Use IdeConfigurationProvider interface
  b07451d... flatpak: Move flatpak manifests from runtimes to configurat
  0d1652d... Update .buildconfig to use the right flatpak runtime
  46587a0... configuration: Make IdeConfiguration derivable
  cbabb21... flatpak: Create GbpFlatpakConfiguration
  d4d10ee... flatpak: Make the flatpak manifest search recursive
  25dd2ee... buildui: Move build-tools plugin to libide
  220b101... buildsystem: Create IdeBuildconfigConfigurationProvider
  f713c89... flatpak: Writeback manifest changes to disk
  b50393d... configuration: Mark config as dirty when IdeEnvironment cha

(*) This commit already existed in another branch; no separate mail sent