Add tasks module and rename trait files

src/app/states/skirmish_states/tasks/digging.rs

@@ -0,0 +1,6 @@
+use crate::app::widgets::CellWidget;
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct DiggingTask<'a> {
+    path: Vec<&'a CellWidget>,
+}

src/app/states/skirmish_states/tasks/mod.rs

@@ -0,0 +1,7 @@
+mod digging;
+mod tasks_enum;
+mod task_trait;
+
+pub use tasks_enum::Tasks;
+pub use digging::DiggingTask;
+pub use task_trait::Task;

src/app/states/skirmish_states/tasks/task_trait.rs

@@ -0,0 +1 @@
+pub trait Task {}

src/app/states/skirmish_states/tasks/tasks_enum.rs

@@ -0,0 +1,4 @@
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum Tasks {
+    Digging,
+}