deprecate the gender property from the protocol entirely (#4496)

* deprecate the gender property from the protocol entirely

* use obsolete instead of deprecated

* add the database migration

* update internal database version as well

cockatrice/resources/genders/female.svg

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cockatrice/resources/genders/male.svg

@@ -1,12 +0,0 @@
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-<!-- Created with Inkscape (http://www.inkscape.org/) -->
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cockatrice/resources/genders/unknown.svg

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Intersexual/Transgendered symbol by Gregory Maxwell. Copyright 2005. GFDL-1.2 only -->
-<svg
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-   version="1.1"
-   width="210"
-   height="280">
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-<!-- 88,65 // -63,-10 -->
-</svg>