Replace the avatar next to the composer with a status entry menu

The checkmark might change, and there appears to be some state tracking mishaps that need to be worked out.

Part of https://github.com/vector-im/riot-web/issues/1528

res/img/icons-checkmark.svg

@@ -0,0 +1,94 @@
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+   xmlns:sketch="http://www.bohemiancoding.com/sketch/ns"
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+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
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+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
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+   type="text/css"
+   id="style3734">
+	.st1{fill:none;stroke-width:2;stroke-linecap:round;}
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+   id="title3736">icons_create_room</title>
+<desc
+   id="desc3738">Created with sketchtool.</desc>
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+   id="_x30_3-Input"
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+   id="_x30_3_x5F_4-Uploading"
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