Ditch right panel tabs and re-add close button (#99)

* Add extra buttons to room summary card

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Remove right panel tabs in favour of X button on each panel

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update room summary card header to align close button correctly

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix typo in pinned messages heading

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update snapshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update tests

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update snapshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update screenshot

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Improve coverage

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* i18n

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix base card title colours

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update snapshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

res/css/views/rooms/_MemberList.pcss

@@ -11,7 +11,6 @@ Please see LICENSE files in the repository root for full details.
     display: flex;
     flex-direction: column;
     min-height: 0;
-    margin-top: 24px;
 
     .mx_Spinner {
         flex: 1 0 auto;
@@ -34,6 +33,7 @@ Please see LICENSE files in the repository root for full details.
 
     .mx_AutoHideScrollbar {
         flex: 1 1 0;
+        margin-top: var(--cpd-space-3x);
     }
 }