Style: Remove unnecessary semicolons from core

Semicolons are not necessary after function definitions or control flow
blocks, and having some code use them makes things inconsistent (and
occasionally can mess up `clang-format`'s formatting).

Removing them is tedious work though, I had to do this manually (regex
+ manual review) as I couldn't find a tool for that. All other code
folders would need to get the same treatment.

core/packed_data_container.cpp

@@ -44,7 +44,7 @@ Variant PackedDataContainer::getvar(const Variant &p_key, bool *r_valid) const {
 
 int PackedDataContainer::size() const {
 	return _size(0);
-};
+}
 
 Variant PackedDataContainer::_iter_init_ofs(const Array &p_iter, uint32_t p_offset) {
 	Array ref = p_iter;
@@ -124,7 +124,7 @@ uint32_t PackedDataContainer::_type_at_ofs(uint32_t p_ofs) const {
 	uint32_t type = decode_uint32(r);
 
 	return type;
-};
+}
 
 int PackedDataContainer::_size(uint32_t p_ofs) const {
 	const uint8_t *rd = data.ptr();
@@ -139,10 +139,10 @@ int PackedDataContainer::_size(uint32_t p_ofs) const {
 	} else if (type == TYPE_DICT) {
 		uint32_t len = decode_uint32(r + 4);
 		return len;
-	};
+	}
 
 	return -1;
-};
+}
 
 Variant PackedDataContainer::_key_at_ofs(uint32_t p_ofs, const Variant &p_key, bool &err) const {
 	const uint8_t *rd = data.ptr();
@@ -368,7 +368,7 @@ Variant PackedDataContainerRef::_iter_get(const Variant &p_iter) {
 
 bool PackedDataContainerRef::_is_dictionary() const {
 	return from->_type_at_ofs(offset) == PackedDataContainer::TYPE_DICT;
-};
+}
 
 void PackedDataContainerRef::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("size"), &PackedDataContainerRef::size);
@@ -389,4 +389,4 @@ Variant PackedDataContainerRef::getvar(const Variant &p_key, bool *r_valid) cons
 
 int PackedDataContainerRef::size() const {
 	return from->_size(offset);
-};
+}