Cleanup: move Python script execution into BPY_extern_run.h

This commit renames 'execute' to 'run' because:

- This follows Python's "PyRun" which these functions wrap.
- Execution functions can use either exec/eval modes,
  making naming awkward (for future API refactoring).

source/blender/python/BPY_extern_run.h

@@ -0,0 +1,68 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/** \file
+ * \ingroup python
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "BLI_sys_types.h"
+
+struct ReportList;
+struct Text;
+struct bContext;
+
+/* bpy_interface_run.c */
+bool BPY_run_filepath(struct bContext *C, const char *filepath, struct ReportList *reports);
+bool BPY_run_text(struct bContext *C,
+                  struct Text *text,
+                  struct ReportList *reports,
+                  const bool do_jump);
+
+bool BPY_run_string_as_number(struct bContext *C,
+                              const char *imports[],
+                              const char *expr,
+                              const char *report_prefix,
+                              double *r_value);
+bool BPY_run_string_as_intptr(struct bContext *C,
+                              const char *imports[],
+                              const char *expr,
+                              const char *report_prefix,
+                              intptr_t *r_value);
+bool BPY_run_string_as_string_and_size(struct bContext *C,
+                                       const char *imports[],
+                                       const char *expr,
+                                       const char *report_prefix,
+                                       char **r_value,
+                                       size_t *r_value_size);
+bool BPY_run_string_as_string(struct bContext *C,
+                              const char *imports[],
+                              const char *expr,
+                              const char *report_prefix,
+                              char **r_value);
+
+bool BPY_run_string_ex(struct bContext *C, const char *imports[], const char *expr, bool use_eval);
+
+bool BPY_run_string(struct bContext *C, const char *imports[], const char *expr);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif