Add digging tasks and unit coordinate support

Introduce Tasks handling for units, store coordinates in MinerUnit,
expose getters/setters for unit tasks, add logging of marked cells,
and provide cell accessors for mutable unit options.

src/app/states/skirmish_states/units/units_enum.rs

@@ -1,5 +1,6 @@
 use crate::app::states::skirmish_states::{
     Players,
+    tasks::Tasks,
     units::{MinerUnit, Unit},
 };
 
@@ -15,6 +16,13 @@ impl Units {
             Self::Miner(m) => m,
         }
     }
+
+    #[inline]
+    fn u_mut(&mut self) -> &mut dyn Unit {
+        match self {
+            Self::Miner(m) => m,
+        }
+    }
 }
 
 impl Unit for Units {
@@ -45,6 +53,14 @@ impl Unit for Units {
     fn get_digging_power(&self) -> f32 {
         self.u().get_digging_power()
     }
+
+    fn get_coords(&self) -> (usize, usize) {
+        self.u().get_coords()
+    }
+
+    fn set_task(&mut self, task: Tasks) {
+        self.u_mut().set_task(task);
+    }
 }
 
 impl Unit for Option<Units> {
@@ -79,4 +95,12 @@ impl Unit for Option<Units> {
     fn get_digging_power(&self) -> f32 {
         self.as_ref().map_or(0.0, |u| u.get_digging_power())
     }
+
+    fn get_coords(&self) -> (usize, usize) {
+        self.as_ref().map_or((0, 0), |u| u.get_coords())
+    }
+
+    fn set_task(&mut self, task: Tasks) {
+        self.as_mut().map_or((), |u| u.set_task(task))
+    }
 }