Colleted esri_wkt and esri_wkt parsing into one function which works, and added find() methods in each mod for easier name-to-obj parsing

pycrs/units.py

@@ -1,5 +1,30 @@
 
 
+def find(unitname, crstype, strict=False):
+    if not strict:
+        unitname = unitname.lower()
+    for itemname,item in globals().items():
+        if itemname.startswith("_"):
+            continue
+        try:
+            if hasattr(item, crstype):
+                itemname = getattr(item, crstype)
+                # compare
+                if not strict:
+                    itemname = itemname.lower()
+                if unitname == itemname:
+                    return item
+                # special handling of wkt meters which has multiple possibilities
+                elif isinstance(itemname, Meter) and crstype.endswith("wkt") and not strict and unitname in ("meters","meter","metre"):
+                    return item
+        except:
+            pass
+    else:
+        return None
+
+
+
+
 class Meter:
     proj4 = "m"
     ogc_wkt = "Meters" # or is it metre?? sometimes even Meter?