Feature 57 (config and provisioning): modules declare config and provisions, their files rendered from templates; synced with main (issues of feature 57, 874)

modules/triggerhappy/files/service.conf

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+# Written by the mesh (module triggerhappy, novox/hq ADR 0212). Replaced on every push.
+#
+# The daemon opens the input devices as root, then drops to the operator's account with its groups,
+# so every trigger runs as the account: it reaches the account's session bus and display, with no su
+# and no hard-coded user. Only the mesh's trigger file is read.
+[Service]
+ExecStart=
+ExecStart=/usr/bin/thd --triggers /etc/triggerhappy/triggers.d/mesh.conf --socket /run/thd.socket --user ${machine:account} --deviceglob /dev/input/event*

modules/triggerhappy/files/triggers.conf

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+# The machine's hotkeys, written by the mesh (module triggerhappy, novox/hq ADR 0212). Replaced on
+# every push: a key is added by the module it belongs to, as a contribution to node-hotkeys.
+# A line is: the key, its state (1 pressed, 2 held, 0 released), the command.
+${contribution:node-hotkeys:trigger}