Closes #211

I need unit tests :/

Allows to set the string value of a key. Perists the value to the
configuration file.

Introduces a small state machine which parses the file character by
character. This eases the logic around parsing whole lines
significantly.

Now also trims lines, handling all non printable characters correctly.

Signed-off-by: Rahix <rahix@rahix.de>

As opposed to defining all possible keys at compile time.

In preparation for next commit

Mostly changing things like if { ... return} else { ... } to not have
an extra indentation level of the else part.

The diff is probably very weird even with stripped whitespace.

Signed-off-by: Rahix <rahix@rahix.de>

Signed-off-by: Rahix <rahix@rahix.de>

swym authored Aug 28, 2019 and Rahix committed Aug 28, 2019

Adds simple config parser along with config_ API that:

- supports default values for options
- allows typed querying of config values
- types supported: boolean, integer, floating point and string

unknown options are ignored and LOG_WARNed on the console