Codechange: Specify underlying type for all enums excluding those exposed to scripts. (#13383)

src/linkgraph/linkgraph_type.h

@@ -44,7 +44,7 @@ enum DistributionType : uint8_t {
  * Refreshing a link makes just sure a minimum capacity is kept. Increasing
  * actually adds the given capacity.
  */
-enum EdgeUpdateMode {
+enum EdgeUpdateMode : uint8_t {
 	EUM_INCREASE     = 1,      ///< Increase capacity.
 	EUM_REFRESH      = 1 << 1, ///< Refresh capacity.
 	EUM_RESTRICTED   = 1 << 2, ///< Use restricted link.

src/linkgraph/refresh.h

@@ -25,7 +25,7 @@ protected:
 	 * Various flags about properties of the last examined link that might have
 	 * an influence on the next one.
 	 */
-	enum RefreshFlags {
+	enum RefreshFlags : uint8_t {
 		USE_NEXT,     ///< There was a conditional jump. Try to use the given next order when looking for a new one.
 		HAS_CARGO,    ///< Consist could leave the last stop where it could interact with cargo carrying cargo (i.e. not an "unload all" + "no loading" order).
 		WAS_REFIT,    ///< Consist was refit since the last stop where it could interact with cargo.