修复源代码中文注释乱码并统一为UTF-8编码，Lora频率改为470MHz频段

1. 修复 source/inc/bsp.h、source/inc/main.h、source/src/bsp.c 中文注释乱码，统一保存为UTF-8编码
2. Lora中心频率由433.1MHz改为470.1MHz~492.6MHz，步进500kHz，共46个信道(CH0~CH45)
3. 新增下载前配置检查注释块，LORA_FREQ默认信道改为CH0
4. 更新Keil调试配置(CMSIS_AGDI调试器及观察窗口设置)

MDK/hc32l17x.uvoptx

@@ -103,7 +103,7 @@
         <bEvRecOn>1</bEvRecOn>
         <bSchkAxf>0</bSchkAxf>
         <bTchkAxf>0</bTchkAxf>
-        <nTsel>6</nTsel>
+        <nTsel>12</nTsel>
         <sDll></sDll>
         <sDllPa></sDllPa>
         <sDlgDll></sDlgDll>
@@ -114,7 +114,7 @@
         <tDlgDll></tDlgDll>
         <tDlgPa></tDlgPa>
         <tIfile></tIfile>
-        <pMon>Segger\JL2CM3.dll</pMon>
+        <pMon>BIN\CMSIS_AGDI.dll</pMon>
       </DebugOpt>
       <TargetDriverDllRegistry>
         <SetRegEntry>
@@ -130,7 +130,7 @@
         <SetRegEntry>
           <Number>0</Number>
           <Key>JL2CM3</Key>
-          <Name>-U4294967295 -O78 -S2 -ZTIFSpeedSel5000 -A0 -C0 -JU1 -JI127.0.0.1 -JP0 -RST0 -N00("ARM CoreSight SW-DP") -D00(0BC11477) -L00(0) -TO18 -TC10000000 -TP21 -TDS8027 -TDT0 -TDC1F -TIEFFFFFFFF -TIP8 -TB1 -TFE0 -FO31 -FD20000000 -FC1000 -FN1 -FF0FlashHC32L17X_128K.FLM -FS00 -FL020000 -FP0($$Device:HC32L170JATA$Flash\FlashHC32L17X_128K.FLM)</Name>
+          <Name>-U4294967295 -O78 -S2 -ZTIFSpeedSel5000 -A0 -C0 -JU1 -JI127.0.0.1 -JP0 -RST0 -TO18 -TC10000000 -TP21 -TDS8027 -TDT0 -TDC1F -TIEFFFFFFFF -TIP8 -TB1 -TFE0 -FO15 -FD20000000 -FC1000 -FN1 -FF0FlashHC32L17X_128K.FLM -FS00 -FL020000 -FP0($$Device:HC32L170JATA$Flash\FlashHC32L17X_128K.FLM)</Name>
         </SetRegEntry>
         <SetRegEntry>
           <Number>0</Number>
@@ -190,16 +190,6 @@
           <WinNumber>1</WinNumber>
           <ItemText>BL.Status,0x0A</ItemText>
         </Ww>
-        <Ww>
-          <count>7</count>
-          <WinNumber>1</WinNumber>
-          <ItemText>BL.Para</ItemText>
-        </Ww>
-        <Ww>
-          <count>8</count>
-          <WinNumber>1</WinNumber>
-          <ItemText>DevMac</ItemText>
-        </Ww>
       </WatchWindow1>
       <MemoryWindow1>
         <Mm>
@@ -223,7 +213,7 @@
       <DebugFlag>
         <trace>0</trace>
         <periodic>1</periodic>
-        <aLwin>0</aLwin>
+        <aLwin>1</aLwin>
         <aCover>0</aCover>
         <aSer1>0</aSer1>
         <aSer2>0</aSer2>