use all spi flash v0.1

* introduced a new communication command CMD_FLASHMEM_PAGES64K to get the number of 64k pages
* "the last page" is a special, holding the dicts and some other stuff, relocated to there
* raised timeout when wiping a mem page (W25Q16 looks a bit slower than W25X20BV)
* loop all pages in Flash_WipeMemory()

include/pm3_cmd.h

@@ -433,6 +433,7 @@ typedef struct {
 #define CMD_FLASHMEM_DOWNLOADED                                           0x0124
 #define CMD_FLASHMEM_INFO                                                 0x0125
 #define CMD_FLASHMEM_SET_SPIBAUDRATE                                      0x0126
+#define CMD_FLASHMEM_PAGES64K                                             0x0127
 
 // RDV40, High level flashmem SPIFFS Manipulation
 // ALL function will have a lazy or Safe version