[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/main/fap_loader/elf_cpp/elf_hashtable.cpp

@@ -0,0 +1,48 @@
+#include "compilesort.hpp"
+#include "elf_hashtable.h"
+#include "elf_hashtable_entry.h"
+#include "elf_hashtable_checks.hpp"
+
+#include <array>
+#include <algorithm>
+
+/* Generated table */
+#include <symbols.h>
+
+#define TAG "elf_hashtable"
+
+static_assert(!has_hash_collisions(elf_api_table), "Detected API method hash collision!");
+
+/**
+ * Get function address by function name
+ * @param name function name
+ * @param address output for function address
+ * @return true if the table contains a function
+ */
+
+bool elf_resolve_from_hashtable(const char* name, Elf32_Addr* address) {
+    bool result = false;
+    uint32_t gnu_sym_hash = elf_gnu_hash(name);
+
+    sym_entry key = {
+        .hash = gnu_sym_hash,
+        .address = 0,
+    };
+
+    auto find_res = std::lower_bound(elf_api_table.cbegin(), elf_api_table.cend(), key);
+    if((find_res == elf_api_table.cend() || (find_res->hash != gnu_sym_hash))) {
+        FURI_LOG_W(TAG, "Cant find symbol '%s' (hash %x)!", name, gnu_sym_hash);
+        result = false;
+    } else {
+        result = true;
+        *address = find_res->address;
+    }
+
+    return result;
+}
+
+const ElfApiInterface hashtable_api_interface = {
+    .api_version_major = (elf_api_version >> 16),
+    .api_version_minor = (elf_api_version & 0xFFFF),
+    .resolver_callback = &elf_resolve_from_hashtable,
+};