Add charging indicator and pacman package, bump to 1.1.0

- Show charge/discharge power in watts, a battery graphic with charge
  bolt, a power history graph and the estimated time until full or
  remaining (respecting the 80 % charge limit) in the app, the panel
  widget, its tooltip and `predatorctl status`
- Add packaging/arch/PKGBUILD that builds a pacman package; the kernel
  module ships as DKMS source and is rebuilt for every kernel
- Bump version to 1.1.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/arch/predator-control.install

@@ -0,0 +1,25 @@
+post_install() {
+    systemctl daemon-reload
+    modprobe predator_wmi 2>/dev/null || echo ":: predator_wmi could not be loaded yet (kernel headers installed? Secure Boot?)"
+    systemctl enable --now predatord.service
+    echo ":: Predator Control installed."
+    echo ":: Add the panel widget: right-click the panel -> Add or Manage Widgets -> 'Predator Control'"
+    echo ":: Only members of the 'wheel' group can change settings."
+}
+
+post_upgrade() {
+    systemctl daemon-reload
+    modprobe predator_wmi 2>/dev/null
+    systemctl try-restart predatord.service
+}
+
+pre_remove() {
+    systemctl disable --now predatord.service 2>/dev/null
+    modprobe -r predator_wmi 2>/dev/null
+    true
+}
+
+post_remove() {
+    systemctl daemon-reload
+    echo ":: Settings were kept in /etc/predator-control (delete manually if no longer needed)."
+}