terminal: use VFS-based font handling

This patch replaces the terminal's formerly built-in fonts with the new
VFS-based font handling.

To avoid the copying of the terminal's font configuration across run
scripts, this patch adds the new terminal/pkg runtime package, which
includes everything needed for instantiating a terminal: the actual
terminal component, the library dependencies (vfs_ttf, which in turn
depends on the libc), a font (bitstream-vera), and a reasonable default
configuration.

Fixes #2758

repos/gems/run/sculpt/leitzentrale.config

@@ -84,8 +84,14 @@
 				<resource name="RAM" quantum="4M"/>
 				<provides> <service name="Terminal"/> </provides>
 				<config>
-					<keyboard layout="none"/>
-					<font size="8" />
+					<vfs>
+						<rom name="VeraMono.ttf"/>
+						<dir name="fonts">
+							<dir name="monospace">
+								<ttf name="regular" path="/VeraMono.ttf" size_px="10"/>
+							</dir>
+						</dir>
+					</vfs>
 				</config>
 				<route>
 					<any-service> <child name="log_nit_fb"/> <parent/> </any-service>
@@ -131,11 +137,8 @@
 						<binary name="terminal"/>
 						<resource name="RAM" quantum="8M"/>
 						<provides> <service name="Terminal"/> </provides>
-						<config>
-							<keyboard layout="none"/>
-							<font size="16" />
-						</config>
 						<route>
+							<service name="ROM" label="config"> <parent label="fonts.config"/> </service>
 							<any-service> <child name="control_nit_fb"/> <parent/> </any-service>
 						</route>
 					</start>