Lots more Document data definition

Schedule updates:

* Defined Schedule types
* Updated schedule loader to validate with pydantic
* Added ability to specify predecessor type and lead/lag

Other structural/outline stuff as well

Oh and added a unit test.

documents/plant/index.rst

@@ -1,6 +1,19 @@
 Plant
 #####
 
+.. raw:: latex
+
+    \begin{landscape}
+
+.. plant-data-table:: plant
+    :columns: PBS, SSC, Abbrev, Description, Tags
+    :max-depth: 4
+    :hide-empty:
+
+.. raw:: latex
+
+    \end{landscape}
+
 .. toctree::
     :glob:
     :maxdepth: 3
@@ -10,8 +23,4 @@ Plant
     Shipyard/index
     *
 
- 
-.. plant-data-table:: plant
-    :columns: PBS, Value, Abbrev, Description, Tags
-    :max-depth: 4
-    :hide-empty:
+