Sort network names case-insensitively
## In brief To match [a recent upstream Quassel change](https://github.com/quassel/quassel/pull/437 ), Quasseldroid should sort networks case-insensitively. Quassel sorts most things alphabetically in a case-insensitive manner, including the nickname list. The network name list should also be sorted case-insensitively to match. ## Test case ### Setup Add three networks, `Alpha`, `beta`, and `Freenode`. ### Before * Alpha * Freenode * beta ### After * Alpha * beta * Freenode
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