Basic: extract namespaces (partially derived from #3276)

Units/parser-basic.r/freebasic-access.d/args.ctags

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+--sort=no
+--fields=+{access}

Units/parser-basic.r/freebasic-access.d/expected.tags

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+i_am_private	input.bas	/^Private Sub i_am_private$/;"	f	access:private
+i_am_public	input.bas	/^Public Sub i_am_public$/;"	f	access:public

Units/parser-basic.r/freebasic-access.d/input.bas

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+# Taken from https://documentation.help/FreeBASIC/KeyPgPublic.html
+Private Sub i_am_private
+End Sub
+
+Public Sub i_am_public
+End Sub

Units/parser-basic.r/freebasic-namespace.d/args.ctags

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+--sort=no
+--fields=+e

Units/parser-basic.r/freebasic-namespace.d/expected.tags

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+first	input.bas	/^namespace first 'first defines something'$/;"	n	end:12
+first_func	input.bas	/^  sub first_func$/;"	f	namespace:first
+second	input.bas	/^  namespace second 'second defines something'$/;"	n	namespace:first	end:11
+first_func	input.bas	/^    sub first_func  'oh a second first_func$/;"	f	namespace:first.second
+second_func	input.bas	/^    sub second_func$/;"	f	namespace:first.second
+first_func	input.bas	/^sub first_func 'oh another first_func$/;"	f

Units/parser-basic.r/freebasic-namespace.d/input.bas

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+namespace first 'first defines something'
+  sub first_func
+  end sub
+
+  namespace second 'second defines something'
+    sub first_func  'oh a second first_func
+    end sub
+
+    sub second_func
+    end sub
+  end namespace 'ignored'
+end namespace
+
+sub first_func 'oh another first_func
+end sub
+
+' vim: bs=2 sw=2 ss=2 ts=2 nu et ft=basic