ComposeBox already specified autoFocus for the ComposeInput.
However, this didn't work because the dialog was disabled when the ComposeInput code tried to focus the textarea.
To fix this, tweak A11yDialog to look for the autofocus attribute when determining what to focus.
This is consistent with the behavior for native HTML dialogs.
Then, have ComposeInput set this attribute if it's in a dialog.
Fixes#1839.
* fix: update to latest sapper
fixes#416
* fix error and debug pages
* requestIdleCallback makes column switching feel way nicer than double rAF
* add export feature
* add better csp info
* workaround for sapper sub-page issue
* clarify in readme about exporting
* fix now config
* switch from rIC to triple raf
* style-loader is no longer used
* update theming guide