Devtool improvements in 2.0 and 2.1 releases:

  * update-recipe: add option to write changes to bbappend
  * update-recipe: avoid updating patches that have not been modified
  * update-recipe: 'auto' mode now defaults to 'patch' mode for git recipes unless commits pushed upstream
  * build: allow disabling make parallelism
  * New "upgrade" subcommand for upgrading a recipe
  * Added handling for local files within recipe
  * Fixed handling of separate build and source directories
  * Proper support for modifying the kernel source
  * New "edit-recipe" subcommand to quickly edit created recipes
  * New "configure-help" subcommand to make setting configure arguments easier
  * New "sync" command to synchronise source with upstream
  * Improved help text, and simplified command-line usage for add/modify
  * deploy-target: now preserves existing files and writes deployed files list to target
  * undeploy-target: supports undeploying all deployed recipes at once
  * modify: create a commit for extra tasks that modify source when extracting
  * build-image: allow specifying packages to add to image
  * search: print SUMMARY value next to recipe name

* Improvements to devtool add / recipetool create:
    * Set up fetched source as a git repository by default
    * Add an option to fetch source from a remote URL
    * handle binary-only packages
    * Support for extracting dependencies from cmake
    * Improved autotools support
    * Basic support for generating custom kernel recipes
    * Support for new npm fetcher/class
    * Support for out-of-tree kernel modules
    * Extract name/version from filename, github/bitbucket URLs, build scripts
    * Extract SRC_URI from local git repositories
    * Handle https://....git URLs
    * Improve license detection
    * Support creating native variants or standalone native/nativesdk recipes
    * Support specifying a subdirectory within the fetched source
    * Allow extension through additional layers e.g. meta-qt5