Updates `Config::tryExpandPath()` to return a vector of expanded path
matches instead of a single path wrapped in an optional, with an empty
vector indicating no matches.
`Config::resolveConfigIncludes()` iterates over all of these matches,
while other instances of path expansion (such as finding the base config
path) retain their existing behavior and only use the first match.
Fully clear the configuration before reloading, so that when the config
is read and merged in there are no existing values which mergeConfig
refuses to overwrite.
Covers the use case where needing to exclude more than 1 output but
still include all other displays.
e.g. I have 3 monitors: laptop + HD + 4K; and 3 bar types:
- The main bar is on the laptop. `output: "laptop-monitor-id"`
- The 4K has a specific waybar bar-1 configuration. `output: "4K-monitor-id"`
- I want all other displays (3rd HD monitor / any HDMI output when presenting)
to have a plain bar: `output: ["!laptop-monitor-id", "!4k-monitor-id", "*"]`
This commit adds support to reading the config base path from the
environment variable `WAYBAR_CONFIG_DIR`. If it is set, but no
configuration is found there, it falls back to the previous mechanism
of using the default paths, without erroring.
