vlq_base128_le: fix type issues in statically typed langs (C#, C++)

Fix #559

common/vlq_base128_le.ksy

@@ -2,7 +2,8 @@ meta:
   id: vlq_base128_le
   title: Variable length quantity, unsigned/signed integer, base128, little-endian
   license: CC0-1.0
-  ks-version: 0.7
+  ks-version: 0.9
+  bit-endian: be
 doc: |
   A variable-length unsigned/signed integer using base128 encoding. 1-byte groups
   consist of 1-bit flag of continuation and 7-bit value chunk, and are ordered
@@ -35,31 +36,28 @@ types:
     doc: |
       One byte group, clearly divided into 7-bit "value" chunk and 1-bit "continuation" flag.
     seq:
-      - id: b
-        type: u1
-    instances:
-      has_next:
-        value: (b & 0b1000_0000) != 0
+      - id: has_next
+        type: b1
         doc: If true, then we have more bytes to read
-      value:
-        value: b & 0b0111_1111
+      - id: value
+        type: b7
         doc: The 7-bit (base128) numeric value chunk of this group
 instances:
   len:
     value: groups.size
   value:
-    value: >-
-      groups[0].value
+    value: |
+      (groups[0].value
       + (len >= 2 ? (groups[1].value << 7) : 0)
       + (len >= 3 ? (groups[2].value << 14) : 0)
       + (len >= 4 ? (groups[3].value << 21) : 0)
       + (len >= 5 ? (groups[4].value << 28) : 0)
       + (len >= 6 ? (groups[5].value << 35) : 0)
       + (len >= 7 ? (groups[6].value << 42) : 0)
-      + (len >= 8 ? (groups[7].value << 49) : 0)
+      + (len >= 8 ? (groups[7].value << 49) : 0)).as<u8>
     doc: Resulting unsigned value as normal integer
   sign_bit:
-    value: '1 << (7 * len - 1)'
+    value: '(1.as<u8> << (7 * len - 1)).as<u8>'
   value_signed:
-    value: '(value ^ sign_bit) - sign_bit'
+    value: '((value ^ sign_bit).as<s8> - sign_bit.as<s8>).as<s8>'
     doc-ref: https://graphics.stanford.edu/~seander/bithacks.html#VariableSignExtend