* Allow backslash after drive name
Before, paths like `C:/path/to/something` were considered absolute, but
`C:\path/to/something` were not
Refs vimeo/psalm#1913
* Revert "Mark testPluginFilenameCanBeAbsolute incomplete on Windows (#1914)"
This reverts commit 210ac39d00.
Since functions defined in files referenced in 'files' section in
composer autoload config are automatically loaded when composer
autoloader is included (for example when Psalm is installed into project
vendors), it's good idea to keep them namespaced. Otherwise it would
prevent dependents to declare their own functions in the global
namespace with the same names.
* Fixedvimeo/psalm#1714
Moved `isAbsolutePath()` into a functions file (`src/functions.php`)
that is now automatically loaded by composer autoload.
/cc: @jwage
* Dropped redundant bootstrap
