refactor(rivet): rename special method __drop__ to __destroy__

lib/core/src/DynArray.ri

@@ -209,7 +209,7 @@ struct DynArray {
         return dyn_array;
     }
 
-    func __drop__(self) {
+    func __destroy__(self) {
         unsafe {
             mem_dealloc(self.ptr);
         }

lib/core/src/string.c.ri

@@ -373,7 +373,7 @@ pub struct string < Stringable, Hashable, Throwable {
         return self > rhs || self == rhs;
     }
 
-    func __drop__(self) {
+    func __destroy__(self) {
         if !self.is_ref {
             unsafe {
                 mem_dealloc(self.ptr);

lib/rivet/src/checker/decls.ri

@@ -203,7 +203,7 @@ extend Checker {
                     );
                 }
                 match func_decl.name {
-                    "__drop__" -> {},
+                    "__destroy__" -> {},
                     else -> report.error(
                         "unknown special method `{}`".fmt(func_decl.name),
                         func_decl.pos

lib/std/src/dynlib/mod.c.ri

@@ -78,7 +78,7 @@ struct Library {
         _ = unsafe { libc.dlclose(self.ptr) };
     }
 
-    func __drop__(self) {
+    func __destroy__(self) {
         self.close();
     }
 }

tests/invalid/directly_call_a_special_method.out

@@ -1,4 +1,4 @@
 tests/invalid/directly_call_a_special_method.ri:9:5: error: cannot call a special method directly
-    9 |     d.__drop__();
-      |     ^~~~~~~~~~~~
+    9 |     d.__destroy__();
+      |     ^~~~~~~~~~~~~~~
 rivet: error: could not compile module `directly_call_a_special_method`, aborting due to previous error

tests/invalid/directly_call_a_special_method.ri

@@ -1,10 +1,10 @@
-struct Dropper {
-    func __drop__(self) {
+struct Destroyer {
+    func __destroy__(self) {
         _ = self;
     }
 }
 
 func main() {
-    d := Dropper();
-    d.__drop__();
+    d := Destroyer();
+    d.__destroy__();
 }

tests/valid/src/special_methods.ri

@@ -1,5 +1,5 @@
 struct SpecialMethods {
-    func __drop__(self) {
+    func __destroy__(self) {
         _ = self;
     }
 }