Fix tab indentation in btrMgr.c lines 9094-9100

[Copilot]

Addresses code review feedback from PR #60 regarding inconsistent indentation in src/ifce/btrMgr.c.

Changes

• Indentation fix: Replaced tabs with 4 spaces in lines 9094-9100 to match surrounding code style
• Build hygiene: Added .gitignore to exclude autotools-generated artifacts (Makefile.in, configure, aclocal.m4, etc.)

The affected code block:

if (ghBTRMgrDevHdlCurStreaming != aBTRCoreDevId) {
    if (BTRCore_DisconnectDevice (ghBTRCoreHdl, aBTRCoreDevId, lenBTRCoreDeviceType) != enBTRCoreSuccess) {
        BTRMGRLOG_ERROR ("Post Device disconnect Cb timeout Failed!\n");
    }
} else {
    BTRMGRLOG_INFO("Not disconnecting device, as device has started streaming\n");
}

Whitespace-only change with no functional impact.

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