Improvement merge text and tspan

[JoKalliauer]

I would like to merge simple <text> with <tspan>

Inputexample:

 <text x="313.88" y="322.89">
  <tspan x="313.88" y="322.89">1</tspan>
 </text>

Output:

 <text x="313.88" y="322.89">1</text>

It does not have to work for everything, but I just want that it works in "simple" cases.

I already for this improvement somewhere else: RazrFalcon/svgcleaner#127 and scour-project/scour#201

[SethFalco]

Closing as duplicate of:

• any reason to not merge <text> and <textspans> when possible? #559
• mergeText plugin to consolidate text/tspan elements #1907