When using lsp-mode with flycheck it hijacks all of the checkers that have been
defined for all of the languages. When added other checkers they never get used
because they are all overridden by lsp-mode.
This adds a function so we can define checkers per mode then we can have lsp and
another checker that is specific for the language
Update the lsp to improve the performance and editing experience. The completion
has been disabled so we can configure it manually to include snippets and file
paths into the company code completion.
Company has been configured to override the tab behaviour to always expand
snippets whenever there is a available snippet. The default behaviour is to
cycle through the completion.
