sbxlm for librime 9.5.15

Commits

• c538e77: optimize is_first logic (sbxlmdsl)
• 1c50135: fix bug of sbjm in third-pop state (sbxlmdsl)
• 77641e1: create words only in temporary buffered mode (sbxlmdsl)
• 9aaab35: fix bugs in sbjm (sbxlmdsl)
• e55bfa3: fix bugs in word creation (sbxlmdsl)
• 7ab56dc: fix more bugs in word creation (sbxlmdsl)
• 184c31e: 反查出的候选项用数字选择 (sbxlmdsl)
• d566921: Revert "反查出的候选项用数字选择" (sbxlmdsl)
• d0a846c: fix more bugs in sbjm (sbxlmdsl)