As discussed in the ticket the Basic IDE does not make it clear that the currently opened module is read-only, which can cause confusion to the user, since they may be pressing keys and seeing no result.
With this patch the IDE clarifies that the module/dialog is read-only in two ways:
1) In the status bar the string "(Read-only)" is added after the module/dialog name
2) When a module/dialog is opened an infobar is shown warning that it is read-only.
3) In a module, if the user closed the infobar and tries to edit the code, the infobar is shown again.
Change-Id: I15197c4316bb2ed19e54be0c33f4fb61b5bbd862
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145307
Tested-by: Jenkins
Reviewed-by: Heiko Tietze <heiko.tietze@documentfoundation.org>
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