[NL] Finetune cover_HassSetPosition

[TheFes]

Changes:

• Added sentences like doe bloemetjesgordijn omhoog naar 50%
• Added sentences like doe slaapkamergordijnen naar 25% omlaag
• make use of numeric_value_set expansion rule
• add spaces inside optional parts instead of outside to avoid double spaces.
• Add stand as variant for position
• Allow stand|postition before the name (with optional van)
• Add tests includling stand|position
• Optionally add the afdekking expansion rule to names

It seems there is no support for floors for HassSetPosition. Is this intentional?

[TheFes]

@frenck and another one :)

PS No code rabbit?