Increase result font size, harmonize bold usage, implement conditional features list bold styling

[nirvn]

This PR cleans up the use of the resultFont style by:

• slightly increasing the font size (larger, easier to read, an important UX with results list :) )
• insuring that all lists use the result font (i.e. relation editor widgets)
• insuring that all lists' result items have non-bold font weight (significant win for the features list)
• insuring that all lists' section header use the brand new strongResultFont

This is how the features list look now (i.e. your eyes are not drowning in bold fonts ;) ):

In turn, this allows us to implement conditional bold styling of features list items, something that couldn't be done when we added conditional styling in QField 4.2 since the items were always bold.

Conditional bold styling in action:

[qfield-fairy]

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